* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}
body {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #e2e2e2;
}
.heart{
    position: relative;
    height: 70px;
    width: 70px;
    background-color: #fff;
    transform: rotate(-45deg);
    border-bottom-left-radius: 100px;
    box-shadow: 0 0  8px rgba(0,0,0,0.15);
    cursor: pointer;
}
.heart::before{
    content: '';
    position: absolute;
    height: 100%;
    width: 100%;
    top: -50%;
    left: 0;
    border-radius: 50px;
    background-color: #fff;
}
.heart::after{
    content: '';
    position: absolute;
    height: 100%;
    width: 100%;
    top: 0;
    right: -50%;
    border-radius: 50px;
    background-color: #fff;
}
.heart,.heart::before,.heart::after{
    transition: 0.6s;
    transition-delay: 0.3s;
}
.heart.forward,.heart.forward::before,.heart.forward::after{
    background-color: #fa345d;
}
.circle{
    position: absolute;
    height: 55px;
    width: 55px;
    left: 7px;
    top: -28px;
    border-radius: 50%;
    z-index: 100;
    transition: 0.6s;
    background-color: #fff;
    box-shadow: 0  0 10px rgba(0,0,0,0.15);
}
.heart.forward .circle{
    animation: move 0.6s forwards;
}
@keyframes move{
    0%{
        left: 7px;
        top: -28px;
    }
    50%{
        top: -1px;
        left: 17px;
    }
    100%{
        left: 42px;
        top: 7px;
    }
}
.heart.reverse .circle{
    animation: back1 0.6s forwards;
}
@keyframes back1{
    0%{
        left: 42px;
        top: 7px;
    }
    50%{
        left: 17px;
        top: 1px;
    }
    100%{
        left: 7px;
        top: -28px;
    }
}